arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.06458physics.opticsphysics.app-ph
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高功率激光器用金刚石反射镜

Diamond Mirrors for High-Power Lasers

H. Atikian, N. Sinclair, P. Latawiec, X. Xiong, S. Meesala, S. Gauthier, D. Wintz, J. Randi, D. Bernot, S. DeFrances, J. Thomas, M. Roman, S. Durrant, F. Capasso, M. Loncar

摘要:

高功率激光器具有许多科学和工业应用。一些关键领域包括制造业中的激光切割和焊接、聚变反应堆或国防应用中的定向能、医学中的激光手术以及半导体行业中的先进光刻技术。这些应用需要光学部件,特别是反射镜,其承受高的光功率以将光从激光器引导到目标。通常,反射镜由不同折射率和厚度的多层涂层组成。在高功率下,这些层中的缺陷导致光的吸收,从而导致热应力和对反射镜的永久损坏。在这里,我们设计,模拟,制造和演示单片和高反射介质镜,在高激光功率下工作而不损坏。这些镜子是通过在单晶金刚石表面蚀刻纳米结构来实现的,单晶金刚石是一种具有特殊光学和热性能的材料。我们测量的反射率大于98%,并证明使用10千瓦的连续波激光在1070 nm,强度高达4.6 MW/cm 2的无损伤操作。相比之下,在这些激光功率,我们观察到损坏的光学涂层的基础上的标准介质镜。我们的研究结果开创了一种新的宽带光学类别,可在极端条件下工作。

英文摘要:

High-power lasers have numerous scientific and industrial applications. Some key areas include laser cutting and welding in manufacturing, directed energy in fusion reactors or defense applications, laser surgery in medicine, and advanced photolithography in the semiconductor industry. These applications require optical components, in particular mirrors, that withstand high optical powers for directing light from the laser to the target. Ordinarily, mirrors are comprised of multilayer coatings of different refractive index and thickness. At high powers, imperfections in these layers lead to absorption of light, resulting in thermal stress and permanent damage to the mirror. Here we design, simulate, fabricate, and demonstrate monolithic and highly reflective dielectric mirrors which operate under high laser powers without damage. The mirrors are realized by etching nanostructures into the surface of single-crystal diamond, a material with exceptional optical and thermal properties. We measure reflectivities of greater than 98% and demonstrate damage-free operation using 10 kW of continuous-wave laser light at 1070 nm, with intensities up to 4.6 MW/cm2. In contrast, at these laser powers, we observe damage to a standard dielectric mirror based on optical coatings. Our results initiate a new category of broadband optics that operate in extreme conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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